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L-605™ • UNS R30605

L-605 is a nonmagnetic cobalt-based chromium-tungstennickel alloy that has excellent corrosion and oxidation resistance, and high strength at both room and elevated temperatures. Through work hardening, high strength levels can be obtained. L-605 has a minimal heat treatment response, but can be used in the cold worked and aged condition. Applications include medical implant devices, springs, valves, and engine components for the aerospace industry. As a result of its high tungsten content, L-605TM is radiopaque, which is beneficial for implant medical devices, such as stents.

Because of the alloy’s high work hardening rate, only minimal reductions can be taken before solution annealing will be required. L-605TM is very resistant to oxidation and scaling at elevated temperatures, and is nonmagnetic in all conditions. L-605 is produced by vacuum induction melting followed by electroslag remelting (VIM-ESR), and as such, has a low nonmetallic inclusion level.

Available Sizes:

L-605 is available from Hamilton Precision Metals as strip product. Contact HPM Sales Department for size capability information. The material corresponds to UNS R30605.

Nominal Composition
Nickel 10%
Tungsten 15%
Chromium 20%
Iron 3.00% Max
Manganese 1.5%
Carbon 0.10%
Silicon 1.00% Max
Cobalt Balance

Mechanical Properties
Ultimate Tensile Strength 165,000 PSI
Yield Strength (0.2% Offset) 85,000 PSI
Elongation in 2”+ 30%
Hardness 91 HRb
Modulus of Elasticity 35.3 X 10^ 6 PSI

+The measured elongation will be less as thickness decreases to 0.003” and less
These values may be adjusted by control of process variables – consult HPM for desired values.

Physical Properties
Density 0.330 lbs/
Melting Point (Approx.) 2500°F
Electrical Resistivity @ R.T. 88.7 Microhm·cm
Thermal Expansion Coefficient (RT to 200°C) 12.9 PPM/°C
Thermal Conductivity @ R.T. 12.7 W/m·K

Typical values to guide alloy selection but are not a guarantee of minimum or maximum.